Facebook has been collecting audio from some voice chats on Messenger and paying contractors to listen to and transcribe them

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Mark Zuckerberg, CEO of Facebook, which acknowledged Tuesday that contractors have been reviewing audio recordings of its users' voice chats.

Facebook has been collecting audio from users' voice chats and paying outside contractors to transcribe them, Bloomberg's Sarah Frier reported on Tuesday.

Users affected are those that opted into having their voice chats transcribed, Facebook told Bloomberg. But the company doesn't disclose in its data-use policies that it collects audio from users or that it sends such data to human transcribers, Bloomberg reported.

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Facebook collects and has contractors transcribe the audio data to check the accuracy of its automated speech recognition systems, according to Bloomberg.

Facebook said it recently "paused" the practice, according to the report.

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